"many" is used with countable nouns. For exemple: "How MANY brothers do you have?" "much" is used with uncountable nouns. For exemple: "Is there MUCH milk in the fridge?" We use lots of in positive and negative sentences, however it is more informal. It can be used with countable or uncountable nouns, and occasionally in questions. "Oh my, you have spent lots of money on clothes!" (uncountable) "I have lots of questions." (countable) and we use few and little to suggest a small quantity. Few is used with countable nouns Little is used with uncountable nouns

I have many things to learn. [You can count things (1, 2, 3,...) so use "many"] I have much to learn. [There's nothing to count, so use "much"] I have a lot of things to learn. I have a lot to learn. [a lot / a lot of [something] = many/much] a few: = about three. "I have a few things to learn" = many (when used with another word like "quite"... "I have quite a few things to learn") Without "a", "few" means the opposite of "many" / "a lot of": He is many friends but she has few friends. Questions: How many things do you have to learn? How much do you have to learn? Do you have a lot of things to learn? Do you have a lot to learn? Do you only have a few things to learn? Do you have quite a few things to learn?